1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_COMPILER_UTILS_DEX_CACHE_ARRAYS_LAYOUT_H_ 18 #define ART_COMPILER_UTILS_DEX_CACHE_ARRAYS_LAYOUT_H_ 19 20 namespace art { 21 22 /** 23 * @class DexCacheArraysLayout 24 * @details This class provides the layout information for the type, method, field and 25 * string arrays for a DexCache with a fixed arrays' layout (such as in the boot image), 26 */ 27 class DexCacheArraysLayout { 28 public: 29 // Construct an invalid layout. DexCacheArraysLayout()30 DexCacheArraysLayout() 31 : /* types_offset_ is always 0u */ 32 pointer_size_(0u), 33 methods_offset_(0u), 34 strings_offset_(0u), 35 fields_offset_(0u), 36 size_(0u) { 37 } 38 39 // Construct a layout for a particular dex file. 40 explicit DexCacheArraysLayout(size_t pointer_size, const DexFile* dex_file); 41 Valid()42 bool Valid() const { 43 return Size() != 0u; 44 } 45 Size()46 size_t Size() const { 47 return size_; 48 } 49 TypesOffset()50 size_t TypesOffset() const { 51 return types_offset_; 52 } 53 54 size_t TypeOffset(uint32_t type_idx) const; 55 56 size_t TypesSize(size_t num_elements) const; 57 MethodsOffset()58 size_t MethodsOffset() const { 59 return methods_offset_; 60 } 61 62 size_t MethodOffset(uint32_t method_idx) const; 63 64 size_t MethodsSize(size_t num_elements) const; 65 StringsOffset()66 size_t StringsOffset() const { 67 return strings_offset_; 68 } 69 70 size_t StringOffset(uint32_t string_idx) const; 71 72 size_t StringsSize(size_t num_elements) const; 73 FieldsOffset()74 size_t FieldsOffset() const { 75 return fields_offset_; 76 } 77 78 size_t FieldOffset(uint32_t field_idx) const; 79 80 size_t FieldsSize(size_t num_elements) const; 81 82 private: 83 static constexpr size_t types_offset_ = 0u; 84 const size_t pointer_size_; // Must be first for construction initialization order. 85 const size_t methods_offset_; 86 const size_t strings_offset_; 87 const size_t fields_offset_; 88 const size_t size_; 89 90 static size_t ElementOffset(size_t element_size, uint32_t idx); 91 92 static size_t ArraySize(size_t element_size, uint32_t num_elements); 93 }; 94 95 } // namespace art 96 97 #endif // ART_COMPILER_UTILS_DEX_CACHE_ARRAYS_LAYOUT_H_ 98